硫磺回收装置脱硫废液处理的试验研究

Experimental Study on Desulfurization Waste Liquid Produced in Sulfur Recycling System

采用将脱硫废液与炼油废水按比例混合之后对其进行处理的方法,通过批式试验,考查混合废液的BOD5/COD指标及其COD、NH3-N、S2-的去除率。筛选合适的混合液配比,分别对500︰1和800︰1的混合废液进行了模型试验,分析了COD去除效果。结果表明:800︰1的混合废液在10d之后,出水COD为134mg/L,达到了《污水综合排放标准》(GB8978—1996)二级标准要求。最终确定炼油废水与脱硫废液混合的合适比例应不低于800︰1。

Desulfurization waste liquid was treated by mixing with the refinery wastewater at a certain ratio, which would not affect the existing refinery wastewater treatment process. Batch experiment and model experiment were both conducted to evaluate the biodegradability of the mixed liquid. By comparing the parameters including BOD5/COD、COD、NH3-N and S2- between influent liquid and effluent liquid, the mixed liquid ratio of 800:1 was effective in effluent COD removal after 10 days with COD concentration of 134 mg/L, meeting Grade Ⅱ of Integrated wastewater discharge standard(GB 8978-1996).The ratio of 800:1 was proposed to be the lowest ratio for the mixed liquid of desulfurization waste liquid and refinery wastewater.